Doh, YJ Chung, MY Chang, HS Lee, HJ 2024-01-21T18:12:13Z 2024-01-21T18:12:13Z 2021-09-01 1997-07 0374-4884 https://pubs.kist.re.kr/handle/201004/143721 We report results on isothermal current-voltage (IV) measurements of a Bi2Sr2CaCu2O8+x single crystal taken both in the ab-plane and along the c-axis in zero magnetic field. Decreasing the temperature, a bulk zero-resistance state develops in sequence characterized by three temperatures, T-c(c), T-g, and T-c(ab). In the temperature range of T > T-c(ab), the in-plane IV curves are all ohmic. The out-of-plane IV curves show very diverse behaviors; ohmic in the high-temperature region above T-c(c), highly nonlinear with an ohmic tail consistent with the effect of thermal fluctuations on Josephson coupling between Cu-O layers for T-g < T < T-c(c), and a down-turn behavior in logarithmic scale showing a true superconducting state with zero linear resistance for T < T-g. This down-turn of the c-axis IV curves is reminiscent of the vortex-glass behavior seen in the in-plane resistivities in an external magnetic field and cannot be explained by the conventional interlayer Josephson coupling model with thermal fluctuation effects. English KOREAN PHYSICAL SOC HIGH-TEMPERATURE SUPERCONDUCTORS VORTEX-GLASS SUPERCONDUCTIVITY GAUGE GLASS TRANSITION MODEL FLUCTUATIONS TRANSPORT Observation of a truly superconducting phase in the c-axis conduction of Bi2Sr2CaCu2O8+x single crystal in zero magnetic field Article 1 JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.31, no.1, pp.19 - 22 JOURNAL OF THE KOREAN PHYSICAL SOCIETY 31 1 19 22 scie scopus A1997XL06300006 2-s2.0-18744364791 Physics, Multidisciplinary Physics Article; Proceedings Paper HIGH-TEMPERATURE SUPERCONDUCTORS VORTEX-GLASS SUPERCONDUCTIVITY GAUGE GLASS TRANSITION MODEL FLUCTUATIONS TRANSPORT high temperature superconductors c-axis conduction Bi₂Sr₂CaCu₂O8+x crystals